How do you read a NGK Spark Plug code?
- The letter combination (1-4) before the heat rating indicates the thread diameter, hexagon spanner width and the design.
- The 5th position ( number) stands for the heat rating.
- The 6th letter identifies the thread length.
- The 7th letter contains data about special spark plug construction features.
How you can read spark plugs and select them?
When reading spark plugs, you will likely find one of the following conditions:
- Normal
- Carbon fouled
- Oil deposits
- Wet
- Burned
- Worn electrodes
- Broken electrodes
What do the numbers on spark plugs mean?
What do numbers mean on spark plugs? The heat rating is a measure of the amount of heat dissipation. The heat range of a spark plug is the range in which the plug works well thermally. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type.
How to read and understand spark plugs?
What Do The Readings And Signs On The Spark Plugs Indicate?
- Carbon Fouling. This may be seen as either black deposits on the spark plug or even dry soot on the tip. ...
- Deposits Of Oil On The Surface Of The Spark Plug. ...
- The Wetness Of The Spark Plug. This may indicate that the engine is firing because you try to start it, and it fails to fire up much often.
- The Spark Plugs Appear Burned. ...
- Pre-Ignition. ...
How to index your spark plugs?
pitch on indexing spark plugs, here is how it is done. If you are parts-bin indexing, then buy 20 different spark plugs of the same part number. One by one, insert them into the different cylinders until you get lucky and your spark plugs line up just like you want them. Parts bin indexing is easy, but time-consuming and expensive.
What do the letters and numbers mean on NGK Spark Plugs?
The heat range of a spark plug is the range in which the plug works well thermally. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type.Jul 7, 2020
How do you read a spark plug code?
“A” indicates a 12 mm x 1.25 with a 3/4″ reach. “Z” indicates a 10 mm x 1.0 with a 1/2″ reach. “G” indicates a 10 mm x 1.0 with a 3/4″ reach. The number (82 in this case) indicates the heat range of the spark plug, the higher the number the hotter the heat range (opposite of NGK and ND spark plugs).Feb 18, 2013
What do spark plug letters mean?
[YC] Firing End Design - The letters after the heat rating indicates a special spark plug construction feature called the firing end design. The letters refer to the center electrode material, projection dimension and ground material.
What does NGK 11 spark plug mean?
An example of an NGK racing plug is R5671A-11. Here, R5671A represents the plug type and -11 represents the heat range. The stock number is 6596. NGK lists a design symbols chart in the front of every spark plug catalog.
What does NGK stand for?
NGK Spark Plugs was founded as a spin-off of the spark plug division of NGK Insulators. Originally, NGK supplied most of its products to Japanese automakers. In 2018 the company became a shareholder of aftermarket data firm TecAlliance. NGK stands for Nihon Gaishi kabushikigaisha, the Japanese name of NGK Insulators.
What does a light tan/gray spark plug tell you?
In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that ...
What does it mean when spark plugs are black?
Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too large a plug gap. If the deposits are wet, it can be an indication of a breached head gasket, poor oil control from ring or valvetrain problems ...
How does a worn spark plug affect the ignition system?
A worn spark plug not only wastes fuel but also strains the whole ignition system because the expanded gap (due to erosion) requires higher voltages. Normal rates of gap growth are as follows: Four-Stroke Engines: 0.01~0.02 mm/1,000 km (0.00063~0.000126 inches/1,000 miles)
What does it mean when a head gasket is wet?
If the deposits are wet, it can be an indication of a breached head gasket, poor oil control from ring or valvetrain problems or an extremely rich condition —depending on the nature of the liquid present at the firing tip.
What is the stock number of a NGK spark plug?
NGK spark plugs also have a NGK stock number. For example, the BPMR7A plug has a stock number of 4626. Both part codes can help you identify the correct part, but only one of them will give you information about the spark plug itself. NGK spark plug codes can be decoded to help identify the suitable replacement or equivalent for an application.
What is NGK spark plug?
NGK have been developing their spark plug technology since 1930 and are the leading manufacturer for spark plugs, that can be used for motorcycles, cars , horticulture and many other plant applications. NGK produces over 1000 different types of spark plug, ensuring they apply to even the most demanding manufacturers’ specifications.
What type of terminals do NGK plugs use?
Here are different types of terminals that NGK spark plugs use: Removable – These terminals can be used with or without a terminal nut to provide connection to the plug cap. These may often cause electrical issues as it may be loose and may damage the plug if is too tight too.
How many types of spark plugs does NGK make?
NGK produces over 1000 different types of spark plug, ensuring they apply to even the most demanding manufacturers’ specifications. NGK spark plugs have two codes that are associated with them. Firstly, there is the spark plug number which represents the specification of the spark plug. NGK spark plugs also have a NGK stock number.
What is the thread reach on a spark plug?
There may be thread exceptions for different models / machines. The thread reach is the measurement from the plug base to the end of the thread. The first part of the part number also indicates when a spark plug has a tapered seat. The seat is the part that is fitted into the cylinder head of the engine.
What happens if you remove spark plugs?
If you attempt to remove you will damage your spark plug. Threaded terminal – An exposed terminal thread. Special / Stud – Terminals that do not fall under the other categories will be a special type of plug and often apply to certain models, such as miniature models and specific NGK plug designs.
What does the first number on a spark plug mean?
The first number (8 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. It is best to use the heat range specified by ...
What is the spark plug code for a motorcycle?
Here is an example of their basic spark plug code. DPR8EA-9. The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug.
What size gap should an 8 spark plug be?
An 8 should be gapped to .8 mm or .032″, 9 should be gapped to .9 mm or .035″, 10 should be gapped to 1.0 mm or .040″ and 11 should be gapped to 1.1 mm or .044″. If there is no number at the end of the spark plug code, it should be gapped to .7 mm or .028″ unless specified differently by the vehicle manufacturer.
What does the U on a spark plug mean?
The “-U” indicates that the ground electrode has a U groove made into it to provide a better initial flame kernel. The letters “P” or “V” would indicate a platinum electrode. The number at the end indicates the recommended spark plug gap in tenths of a millimeter.
What does 24 mean on spark plugs?
The number (24 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions.
What does the R on a radio mean?
The “R” indicates a resistor type spark plug. Resistor type spark plugs reduce the amount of radio frequency interference (rfi) that can cause ignition misfires and static on the radio, if so equipped. The “-U” indicates that the ground electrode has a U groove made into it to provide a better initial flame kernel.
DENSO Spark Plug Symbol Code
Please note that due to the large amount of technical data contained in these symbol code tables it is not always possible to read them clearly from directly from the web page. You may need to click on the symbol code image in order to download a larger copy for viewing one section at a time.
NGK Spark Plug Symbol Code
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CHAMPION Spark Plug Symbol Code
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